Noun
A house established for the convenience of the post, where relays of horses can be obtained.
A house for distributing the malls; a post office.
Source: Webster's dictionaryYou only have to look at the debacle that went on when works started on the housing down the Tring Road opposite the Holiday Inn (Posthouse that was) to see that they were not in control. Source: Internet
The accident is thought to have involved a lorry and a car and happened between the Posthouse and Sainsbury’s roundabouts just after 3pm today. Source: Internet